Hi! I see you're having trouble with the Santander Bank US app—it keeps closing and won’t open. Let’s get this sorted out together.

To start, could you please tell me if you’ve already tried opening the app after restarting your device or if you've attempted any fixes so far? Also, when did this issue start happening? This info will help me guide you better.

In the meantime, here’s a straightforward step-by-step you can try to fix this issue on your Windows device running version 10:

1. Restart your computer: Sometimes, a simple reboot can clear up temporary glitches that cause apps to crash on launch.

2. Check for app updates: Since you’re on Windows with WebKit browser, confirm you're accessing the latest version of the Santander US app (or if it’s a web app, ensure your browser is up to date). Older versions often cause crashes.

3. Clear app or browser cache (assuming you're using either a web app or Windows app):
- For a Windows app: Go to Settings > Apps > Santander > Storage (if available) and choose to clear cache or data.
- For a web version: Clear your browser cache in WebKit by opening browser settings, finding the "Clear browsing data" option, and removing cached files. This removes corrupted data that can cause crash loops.

4. Check internet connectivity: Make sure your network connection is stable. Try switching from Wi-Fi to Ethernet or vice versa and see if the app opens.

5. Reinstall the app: If you’re using a dedicated app, uninstall it completely and then reinstall the latest version from the official source.

If none of these help, there might be an underlying account issue, or the app might have a compatibility problem with your current OS or browser version. We can look deeper from there.

Does this make sense so far? Feel free to share what you’ve already tried or any other details about your setup!

Are you satisfied with this initial approach so far?